220131187 has 2 divisors, whose sum is σ = 220131188. Its totient is φ = 220131186.

The previous prime is 220131161. The next prime is 220131203. The reversal of 220131187 is 781131022.

It is a happy number.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 220131187 - 2¹¹ = 220129139 is a prime.

It is not a weakly prime, because it can be changed into another prime (220131787) by changing a digit.

It is a pernicious number, because its binary representation contains a prime number (19) of ones.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 110065593 + 110065594.

It is an arithmetic number, because the mean of its divisors is an integer number (110065594).

Almost surely, 2^220131187 is an apocalyptic number.

220131187 is a deficient number, since it is larger than the sum of its proper divisors (1).

220131187 is an equidigital number, since it uses as much as digits as its factorization.

220131187 is an odious number, because the sum of its binary digits is odd.

The product of its (nonzero) digits is 672, while the sum is 25.

The square root of 220131187 is about 14836.8186279943. The cubic root of 220131187 is about 603.8010424264.

The spelling of 220131187 in words is "two hundred twenty million, one hundred thirty-one thousand, one hundred eighty-seven".